21514636 has 48 divisors (see below), whose sum is σ = 45793440. Its totient is φ = 8709120.

The previous prime is 21514613. The next prime is 21514643. The reversal of 21514636 is 63641512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15940 + ... + 17236.

It is an arithmetic number, because the mean of its divisors is an integer number (954030).

Almost surely, 2^21514636 is an apocalyptic number.

21514636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21514636 is an abundant number, since it is smaller than the sum of its proper divisors (24278804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21514636 is a wasteful number, since it uses less digits than its factorization.

21514636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354 (or 1352 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 21514636 is about 4638.3872197133. The cubic root of 21514636 is about 278.1279710325.

The spelling of 21514636 in words is "twenty-one million, five hundred fourteen thousand, six hundred thirty-six".